<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="/registerServlet" method="post">
  用户名：<input type="text" name="username"><br>
  密码：<input type="password" name="password"><br>
  <input type="submit" value="注册">
</form>
</body>
</html>